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Oct. 30, 1928. 1,689,986

w. E. WEATHERLY AMPLIFYING ATTACHMENT FOR HOHNS O F SOUND REPRODUCING INSTRUMENTS Filed Oct. 13, 1926 Patented Oct. 30, 1928.

winson a'iyEAriiERLYI Anphcationffiied October 13, 19213.

-My present invention relates' to' the pro'- vision of an 'amplifying-attachment forthehorns ,of sound reproducing 3 instruments.

VVhile' my attachmentimay be employed with '5adva'ntage ina' suita'ble-ca sefwith"anysucll. 1.11 m; -it' was designed-more arti'cularly for; use i'ivith "the'inventibn di'scg'sedin- United- States mp-tars; Patent- No: 1}3635 l82, "dapedj M December 28, 19 20?" By refer 'n'e to this '"patent it will be seen" that the'jhorn' therein em; ployed is a 'eon'v'olute s'ea 'sheillq'r eo'richl Ifhe horns in such instruments are in 'the mselves' amplifying" elements? That is to say," the horns" notonlydirect' the' -sbanmas maybe desired but,.also, by reason of holding"a particular bo'dyof flair ina" particular relation' to tliev'ibratin'g diaphragn'i of'the sound rep'rodu''e'ing' instruriient-' the air"- rvithi'n the a horn is'icaused to fvibrateso thattheyibrations" are transmitted tot-he exterior air much more effectively than they are or can: be diretly from the diaphragm i vitlfoiit"the h'or n. This" being so ,itfwillj'be further' appre ,ciated that different kinds I {particularly 'strengths of sdiind can riione'feifativay" radiated the "selection of awlro'rh ofja'pa'rticularkind ld$pCi'2illy s'iz eZ: 3 of the intensity of "convi'sationa'l "speech can be most effectively handled with a horn of relatively moderate size, Whereas sound of the same intensity would be practically lost in a relatively large horn. And, conversely,

a sound of great volume, or vibrations of relatively large amplitude capable of producing sound of great volume, cannot be elfectively handled by a horn of relatively small size. With sound reproducing machines employing an undulatory record the range of the intensity of sound was not great and a single horn very satisfactorily covered the entire range. With the introduction of electrical amplification, however, vibrations of such an amplitude are produced that they cannot be most effectively handled by horns of the size employed on machines of the phonograph type. It. is now not at all uncommon to attach electrical sound reproducers, or What is known as loud speakers, to phonograph horns, and in such cases my invention may be advantageously employed.

l'Vlien a conch shell is employed as an amplifying horn, as described in the aforementioned patent, however, my invention is necessary in order to secure a high effior oii'IcAGo, ILLINOIS, .assrcnoa rro AUST N B'II'AND, on. i -.-R.,IVERTON, WEST VIRGINIA.

Efee't' 0f horn spat-e1 This rem-ma relatively =-true no 'matterivhether an; "added i length of column ofvibiating air lie tapered or c ylindri'cal and no matter \vhether' it b" coiled or straight'j' 2;.- 'I have increasedtheefiiciency o p lify mg horns 1 for handling strong by mea s of" the st uctures i'lli'is't'rzitdiii accompanying 'dravvin'gfin yvhich- I I lis ele vati'oh offa soaad-reprbdu'c ing' or loud "speaker unit, an amplifying at-f taehment, "and "a 'c'onch in assembly, the "am- .1 plifyirig"attachment b'eing shotvn 'partiallyf' ls ti h; ,.Z .i w," fill g u-J Fig: '2 is top pla'nio f the amplify night" tachment with the top removed;

Fig. 3 is a perspective of an adapter for bringing" the location of the assembly be 86 tween the amplifying attachment and the conch to the center of the amplifying attachment when that may be desired;

Fig. 4 is an elevation of an assembly when the adapter is employed; and

Fig. 5 is an elevation of an assembly in which a modified straight instead of coiled form of amplifier is employed.

Similar reference characters are employed to designate similar parts throughout the several figures.

I have schematically shown at 10 a form of sound reproducing or loud speaker unit resting on a base, 11, and having in the center of its upper face an aperture for the radiloo ation of vibrations set up or created within the unit. Extending upwardly from the aforesaid aperture is a short length of tube forming an annulus, 12.

Fitting around the annulus 12 is another annulus or collar, 13, secured around a central opening to the lower face or bottom of a. cylindrical casing, 14, closed by a top or and also to brill 20 shown. in Fig.

cured to tlietop '15 of as its annulus 1,3.

cover, 15, secured thereto by screws, 16, and adjacent the ed e whereof is an opening surrounded byfaho low enibossment or annulus, 17.

Mounted within the casing 14 with its ends in' communication "respectively with the openings surrounded by annuluses 13 and 17 is a coiledtube, 18.

Thesnl'allend of a conch, 19, is apertured,

and may be cemented directly into the annulus, 17, or into an open ended ferrule, 20,

a1 fitsinto the annulus 17 or 19?, as shown I l -T a Y described construction will 16 function sat sfactorily, :but in order to give [I on the top ofrtheplate 21 is a hollow deve opment or embossment 22, .the cavity 25 whc rcof communicates with the opening in the;pl ate"2l,,and' extends therefrom to the opposite side of the plate, the said embossment terminating in an upstanding socket 23 communicating with the cavity within the embOSWQM, and into which socket the small aperturedend of the conch l9 sets.

, I1 5 Ihave illustrated a modified form of amplifyingattachmentin which the tube 18 is not encased but extends upwardly from vI have shown the tube 18 slightly :fiared as it extendsupwardly but this isnot importantso far as the sound effects are concerned and is done to provide a suflicicnt area at the topv to accommodate the annulus 14* into which the small apertured end of the conch 19, or the ferrule 20, \Vhat I 'believe ,1 have contributed to the art is the knowledge that the flared outer end or horn of the sound conduit is the important feature so far as tonal effects areco-noerned and that the length of passage included in or contiguous to and communicating with the horn is most effective in adapting the horn i'or eliiciently handling different volumes or intensities of sound, and that I have utilized these principles in providing an auxiliary amplifying element adapted to be inserted between the sound reproducing element and the flared or horn portion of the sound conduit.

It will be seen that in the form shown in Figs. 1 and 4 the sound proceeds from the loud speaker element 10 through the curved tube 18, to and through-thehorn 19, and that in the construction shown in-Fig fi, the'sound proceeds from the loud speakerelement 10 through the amplifying attachment 18"-.to and through the conch 19. I

Having descii bedmy inyentioii what I claim as new and desire to secure by Letters.

Patent is- 1 r An attachment for lengthening the volume of air included withinanamplifying horn comprising a base having a chamber for the reception of a loud speaker unittherein,

a stub tube ,rising from said base and having I communication with V the chamber therein, a casing having apertures therein, collars surrounding said apertures and adapted to receive respectively said stub tube and the small end of an amplifying horn, and a coiledtube within said casing having communication at its endswith said agertures. v 1 p p WILS N E. WEATHERLY. 

